85971884077 has 4 divisors (see below), whose sum is σ = 86219642016. Its totient is φ = 85724126140.

The previous prime is 85971884039. The next prime is 85971884087. The reversal of 85971884077 is 77048817958.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85971884077 is a prime.

It is a super-2 number, since 2×85971884077² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85971884017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123878449 + ... + 123879142.

It is an arithmetic number, because the mean of its divisors is an integer number (21554910504).

Almost surely, 2^85971884077 is an apocalyptic number.

It is an amenable number.

85971884077 is a deficient number, since it is larger than the sum of its proper divisors (247757939).

85971884077 is a wasteful number, since it uses less digits than its factorization.

85971884077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247757938.

The product of its (nonzero) digits is 31610880, while the sum is 64.

The spelling of 85971884077 in words is "eighty-five billion, nine hundred seventy-one million, eight hundred eighty-four thousand, seventy-seven".